Deep-well pump



Dec. 28,1926. 1,612,142

W. A. MINOR DEEP WELL PUMP Filed Jan. 18. 1926 2 Sheets-Sheet 1 4265 ATTORNEY5 1,612,142 W. A. MINOR DEEP WELL PUMP Filed Jan 18, 1926 Zjheets-Sheet 2 Dec. 28 1926.

WEE FEFEMLT aflnn uh Hui; T TI I fim ATTORNEY 5.

Patented Dec. 28, 1926.

tll if'iE STATES Pram rams.

WILLIAM A. MINOR, OF ROCHESTER, NEW YURK, ASSIGNOR- TO LUITVIIELER PUMPING ENGINE COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

DEEP-WELL PUMP.

Application filed January 18, 1926. Serial No. 81,923.

The present invention relates to deep well pumps of the type in which a bucket or piston is supported on a rod operated from a mechanism at the top of the well, and an object of this invention is to so operate the rod that the latter will not be subjected to sudden strains and stresses by the operating mechanism at or near the time of the reversing movements of the rod. A further object i of the invention is to give to the plston a movement which will enable the latter to run at high speed and, at the same time, to provide for a uniform delivery of the fluid. A further object of the invention is to provide a deep well pump having a plurality of pistons or rods in which the water or fluid load is effectively shifted from one piston to the other without vibration or shock.

To these and other ends, the invention consists of certain parts and combinations of parts, all of which will be hereinafter described: the novel features being pointed out in the appended claim.

In the drawings Fig. 1 is a view in elevation of the upper portion of a pump embodying this invention with parts in section;

Fig. 2 is a view in section of a lower porfm tion of the pump in proximity to the two pumps or pistons;

Fig. 3 is a plan view of a cam whlch may be employed for securing the results of this invention;

Fig. 4 is an edge view of the cam; and

Fig. 5 is a diagram of the movement curve of the cam.

In the illustrated embodiment of the invention, 1 indicates a frame which may be of any suitable construction supported preferably upon a concrete base 2 and having a pump cylinder or case 3 depending therefrom within a well casing i. Operating in the pump casing are two buckets or pistons 5 and 6, each provided with a valve 7 which is normally held closed by a spring 8. Connected with the lower piston is a rod 9 which extends upwardly therethrough through the upper piston and through a hollow rod 10 which. is connected to the upper end to a reciprocating frame or yoke 11 guided on the main frame 1 while the hollow rod 10 is secured at its upper end to a frame or yoke 12 guided vertically on the frame 1.

Arranged to turn on the frame 1 is the are main shaft 13 which carries two cams 14: and 15, each of which cooperates with a roller 16. Each cam 14. and 15 has a supplemental cam 17 on one side thereof which cooperates with a roller 18 on its slide frame or yoke 11. This supplemental cam 1? is provided in order to assure the descent of the rods in the event they should not descend under their own weight. All of the foregoing parts with the exception of the construction of the cam 14 are well-known and may be varied within the terms of the appended claims.

A feature of this invention is to so operate each of the rods that they will not be, subjected to sudden strains and stresses at the time of the reversal of their movements and also to give to the piston a movement which will enable the latter to be run at high speed and, atthe same time, to provide for a uniform delivery of the fluid. From this also flows the advantage that the pump may be run more economically as to power, because there is no sudden starting and stopping of the pistons at the ends of their movements and because the water delivery is constant.

In the present embodiment, the foregoing results have been accomplished by the shaping of the cams 14 and 15, but it will be understood that the invention is not limited to a cam for producing these results as it is apparent that the same results may be accomplished by equivalent mechanical means. Each cam 14 and 15 is, in this instance, shaped as shown in Fig. 3 of the drawings, starting with a low point between the lines ab which are substantially concentric with the axis of the shaft 13 of the cam. During this portion of the movement of travel of the cam, no movement ofv the rod or bucket takes place. The cam has a surface bc which is what may be termed anacceleration curve.

This acceleration curve starts the rod and bucket on its first part of ascending movement, first stretching the rod and in effect lengthening the rest period and then starting the bucket to move at its uniform speed. The surface from the point 0 to a point a? is so formed that it maintains the speed of travel of the rod and its bucket at a uniform rate which is maintained until the rod with its bucket approaches the upper portion of its movement. Thereafter, a portion of the cam between the points d and e is brought into operation and this portion acts as a retarding portion which slows down the speed of the rod toward the point e which is the eration due to the weight of the rod"; the" bucket and the water uponthe-oucket. The

amount that this rod is relaxed plus the amount of movement eil'ected-hfy the portion d e'of'the cam is such that the movement of thepiston-or bucket continued to beamiform or substantially at the same speedstha't it was moving while travelling the greater portion of the way upward inthecylinder or between the points cand (Z; As a result,- when the heginningof the point e ofrthe' cam isreached, the rod will beuntension-ed: or relaxedi From the point etc the point f the cam" has a surface concentric witlithe axis 13 and acting'as' a rest period at which time the rod and the piston momentarily stand still to overcome inertia to prepare; themselves for the descending movement. This descending movement is controlled by aisurface f on the cam whichis so formed that it permits the descent of the rod and its bucket at a gradually increasing speed, so that during the first part of the downward movement or drop the rod descendswithout any'bucl-rling' or bending action; Fronrthe point g-to the point h,the camhas'a:-sur:face which controls the descent of the red at a uniform speed; When the point h or theiend of the surface g. is reached another retarding action is imposed upon the rod." This is effected' by the surface hetween'the points It and a: This retarding action slows up the rod and itsihucket so as to permit the rod again to relax and, at the S&1116'tl111e,':t place it in condition forstoppingwhen'the lower rest period isreached again.

The" lower point of the cam is notdiametrically opposite the high peintso that, when thetwo cams are'brought into operation, there is an overlap periodwhieh permitsan easy transfer of the water load frcin one pistonto the other; This overlap period from-onepiston to the other occu' J between the points a and 2' on the surface of the cam when the cams are spaced 180. apart as shown. That'the uniformity of the flow of the'pump will'be apparent, reference is-had to the diagram illustratedinFigi 5. In this diagram it will he noted that the velocity curve'is straight or uniform'or-both at the upward and the downward: motion; except at the ends and thehigh point'of t-herdiagram.

In pumps'of this type, the water load on the pistons reaches considerable propor ti ens ofte'n'=as*n1uch' 1S-80G0 pounds or more" per piston. NVith i this meant of." load; hanging;

on the end of three or four hundred feet of sucker rod, there is great deal of elongation in the rod on its power stroke and this has heretofore been released with violence h cause the load has heen relieve'd' suddenly. This factor alone lias been the cause of rapid wear and operating difrleulties and has only been" eliminated by reducing the speed of the driving mechanism. Another ditiiculty encountered heretofore has been caused by the'lackof. control of. the inertia of the rods due to their great weight-and velocity in one direction. T his has been heretofore suddenly-reversed at the upper endof the stroke by the supplemental cam which received the shock of the upward movement, and: then suddenly started the rod with the piston in the opposite direction, the reversal the lower part of the stroke heingeifectedby the main cam and under like: conditions. Furthermore, the operation ofthe pump could onlyhe eti'ected by running. the pump at a slow speed forif thep'ump were running at a high speed the momentum of thepistons and rods would cause the latter to-jump oh the cams producingthe pumping action and 1' the destruction of the cams as a whoie. his diiiiculty could be overcome to some e1;- teut by changing the shape of the cam but this had the eifect of making it impossible to obtain a uniform delivery oft-he fluid load. thus reducing" theainount of water possible to he pumped out of a given well in a given time. it must be recognized that these pumps are expensive apparatus and to be economical must produce the lnaximum fluid delivery from a given well.

What I claim as my invention and desire to secureby Letters Patentlisz A deep well pump. comprising. a cylinder, a piston operating thereima rod connected to the piston and operatinginechanism for reciprocating the piston in the cylinder havinga cam provided with two surfaces con centric with its axis for producing rest periods atthe top and=the bottom of the movement of the piston, a surface formed toproduce a uniform upward motion, a shorter so :ce formed to produce a-uniforrn dovvnwait motion at r 2' speed than the upward motion, a retarding surface between the'surfuce producing the upper-rest period and the surface producing the upward movement, an accelerating surface between the rest period producing surface and the surface producing the downward motion, a retar'dingz surface between the surface producijng the downward motion and the surface producing thelower rest'period and an acceiei ating" surface betweenthe surface producing-thelower rest period andthe surface producinn' the upward motion;

w-nirnrr r A; Evil-NOR. 

